core_admin_homepage-layout:1 is givving error after importing #234

Bug report

Describe the bug

when trying to import the home widgets the serializer is removing updatedAt which is needed for the homewedgets to load or to update

Steps to reproduce the behavior

1. Go to 'Strapi Admin home page'
2. Click on 'update any widget(size, delete, or add one)'
3. Go to settings to import the changes
4. now when ever you try to update the widgets it wil not work

Expected behavior

it should work after importing the changes

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Code snippets

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